I would love to do it, but unfortunately most APIs forbid imports and only allow you to store pictures for caching purposes (Flickr [1], Google Photos [2]) and have restrictions / heavy fees for commercial usage.
Dropbox import is planned, I havent looked at SmugMug API's terms yet but will add it to the todolist.
[1] https://www.flickr.com/help/terms/api [2] https://developers.google.com/photos/library/guides/acceptab...